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  • 1
    Electronic Resource
    Electronic Resource
    Equation of state for polymer solids (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 2831-2836 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simple, three-constant pressure-volume-temperature PVT equation of state, previously applied to polymer liquids, is applied to polymer solids, both crystalline and amorphous. In terms of reduced variables P¯=P/B0, V¯=V/V0, and T¯=T/T0, the equation P¯ V¯5=T¯3/2−ln V¯ fits experimental volume data taken from the literature for 19 polymers to within the accuracy of the measurements, about 0.1%. Using the different sets of reducing parameters for the liquid and glassy states of an amorphous polymer, a second order phase transition is predicted. At zero pressure, this transition temperature T2 lies about 20 K below the glass transition temperature Tg but has a greater pressure dependence. It was also found that the combination of reducing parameters RT0/B0V0 is approximately constant for amorphous and crystalline polymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335881
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  • 2
    Electronic Resource
    Electronic Resource
    ULTRASONIC BEHAVIOR OF CROSS-LINKED POLYMERIC GLASSES (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 371 (1981), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1981.tb55673.x
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  • 3
    Electronic Resource
    Electronic Resource
    The utilization of technology assistance by small manufacturers (1993)
    Springer
    The journal of technology transfer 18 (1993), S. 84-90 
    Details
    ISSN: 1573-7047
    Source: Springer Online Journal Archives 1860-2000
    Topics: Technology
    Notes: Abstract This paper examines the extent to which small manufacturers in the Nashville metropolitan area have installed the latest technology and used external public and private sources of technical information. A mail survey of 404 manufacturing firms was conducted with 123 firms responding. Results indicate that small manufacturers in Nashville need technological assistance and that the existing assistance network (e.g., federal and state assistance agencies) is not effectively serving this need.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02178122
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  • 4
    Electronic Resource
    Electronic Resource
    Gruneisen parameter for polyamides (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 1927-1935 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: For the five aliphatic polyamides, poly(caprolactam), poly(ω-aminoundecanoic acid), poly(ω-aminododecanoic acid), poly(hexamethylene adipamide), and poly(hexamethylene sebacamide), experimental values were obtained of the thermodynamic properties: molar volume, volume thermal expansion coefficient, isothermal bulk modulus, and molar heat capacity. These properties were combined to form the dimensionless ratio known as the Gruneisen parameter. All of the experimental properties were analyzed in terms of molecular components using the method of additive properties. It was concluded that the hydrogen bonding found in polyamides produces a highly localized region of very low Gruneisen parameter.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840919
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  • 5
    Electronic Resource
    Electronic Resource
    Calculation of temperature and pressure dependence of heat capacities in polymer melts (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 31 (1986), S. 2377-2385 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A new PVT equation of state PV5 = T1/2 - ln V where P = P/B0, and T = T/T0, was used to calculate the temperature and pressure dependence of Cp - Cν for polymer melts. The results are in the form of universal master curves in terms of reduced variables. As a function of temperature, a maximum in Cp - Cν is predicted, while as a function of pressure a minimum is predicted. Supplementing the PVT equation with experimental Cp (T) data from the literature, Cp/Cν was also found to have a maximum as a function of temperature. Two useful approximations were also found. One is related to the Nernst-Lindemann equation for Cp - Cν and the other is the approximate constancy of RT0/B0V0.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1986.070310734
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal and dynamic mechanical properties of polyurethaneureas (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 35 (1988), S. 1829-1852 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Measurements were made of the thermal and dynamic mechanical properties of 22 polyurethaneureas of varying diol molecular weight, type of aromatic chain extender, diol molecular weight distribution, and chain extender stoichiometry. The dynamic mechanical data, obtained as a function of temperature and frequency (in the kHz region), were used to construct master curves of shear modulus and loss factor over a wide range of reduced frequencies. Based on these master curves, interpreted in conjunction with the thermal analysis results, it was found that: Soft segment crystallization occurs at the higher diol molecular weights, dynamic mechanical properties are well correlated with the soft segment glass transition, diol molecular weight influences dynamic mechanical properties by affecting the degree of phase separation and hence glass transition temperature, and neither diol molecular weight distribution nor chain extender stoichiometry have a significant effect, in the ranges studied, on transition temperatures or dynamic mechanical properties.
    Additional Material: 25 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070350710
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  • 7
    Electronic Resource
    Electronic Resource
    Reaction kinetics for hindered amine/epoxides by DSC (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 33 (1987), S. 2959-2964 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The rate constants for the reaction of two aliphatic hindered amines with phenylglycidyl ether (PGE) and the diglycidyl ether of bisphenol A (DER 332) were determined by differential scanning calorimetry (DSC). The two exothermic peaks which are present in the DSC data result from the consecutive reactions of the primary and secondary amine hydrogens and allow k1 and k2 to be determined. The resulting k1/k2 ratios obtained for these hindered amine systems are larger than the ratios previously reported for unhindered amine/epoxides.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070330828
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  • 8
    Electronic Resource
    Electronic Resource
    Steric hindrance in the amine-epoxide reaction (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 26 (1988), S. 79-87 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The effect of steric hindrance on the reaction of silicon-containing aliphatic amines with phenylglycidyl ether (PGE) has been studied using 13C-NMR, a technique described by Sojka and Moniz [J. Appl. Polym. Sci., 20, 1977 (1976)]. It was found that steric hindrance produced a large change in the reaction rate of the primary and secondary amine hydrogens, thus leading to a separation of the polymerization and cross-linking reactions.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1988.080260108
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  • 9
    Electronic Resource
    Electronic Resource
    Tensile yield in poly(chlorotrifluoroethylene) and poly(vinylidene fluoride) (1991)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 31 (1991), S. 231-238 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Uniaxial tension tests to the yield point were performed on poly(chlorotrifluoroethylene) (PCTFE) and poly(vinylidene fluoride) (PVF2) from room temperature to near the melting point at a strain rate of 2 min-1. At room temperature and at least two elevated temperatures, measurements were also made at strain rates from 0.02 to 8 min-1. The properties of these polymers were found to be similar to those of other semicrystalline polymers. In the absence of other transitions, yield energy was found to be a linear function of temperature extrapolating to zero near the melting temperature. The ratio of thermal to mechanical energy to produce yielding is smaller than for glassy polymers. Yield stress is a linear function of log strain rate. The ratio of yield stress to (initial) Young's modulus is about 0.03 at room temperature for both polymers. Yield stress is a linear function of unstrained volume. Yield strain, elastic, and plastic strain all initially increase with temperature, but PCTFE shows a decrease with temperature starting at about 100°C, thus behaving like a glassy amorphous polymer in this region.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760310405
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  • 10
    Electronic Resource
    Electronic Resource
    PVT scaling parameters for polymer melts (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 37 (1989), S. 2603-2616 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Scaling parameters for two PVT equations of state are evaluated for 11 polymer melt systems using a nonlinear least square fitting algorithm that analyzes all of the experimental data simultaneously. Two different criteria are considered in this evaluation. In the first method, the fitting criterion is the difference between the calculated and experimental volume. In the second method, the criterion is the difference between the calculated and experimental pressure. In both cases, the differences between the scaling parameters obtained using the simultaneous fit procedure and those obtained using the earlier consecutive fit procedure are a few percent, which can have a significant effect in some calculations. In addition to being a more consistent method of evaluating scaling parameters, the simultaneous fit procedure leads to much better agreement between calculated and experimental values, in some cases by a factor of 2.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070370912
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